Home / 2,115.42-2,918.88-1,370.32

Finding the Fourth Proportional to 2,115.42, 2,918.88 and 1,370.32

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Solution

The fourth proportional to 2,115.42, 2,918.88 and 1,370.32 is: 1,890.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.42 : 2,918.88 = 1,370.32 : x
  2. Step 2: Convert to fraction form
    2,115.42/2,918.88 = 1,370.32/x
  3. Step 3: Cross multiply
    2,115.42x = 2,918.88 × 1,370.32
  4. Step 4: Simplify right side
    2,115.42x = 3,999,799.64
  5. Step 5: Solve for x
    x = 3,999,799.64/2,115.42
  6. Step 6: Final answer
    x = 1,890.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.